TY  - RPRT
TI  - Combined single subject trials.
AU  - T Johannessen
AU  - D Fosstvedt
AU  - H Petersen
PY  - 1991
DO  - 10.3109/02813439109026577
UR  - https://pubmed.ncbi.nlm.nih.gov/2041924/
ID  - 2041924
ER  -